Variable-speed transmission



Nov. 4, 1930. s. B; GOLD FlT'AL VARIABLE SPEED TRANSMISSION Filed Oct. 20,1928 2 SheetsSheet l and 5/ 00 AfiuRNEY Nov. 4, 1930. s. B. 601.0 E AL VARIABLE SPEED TRANSMISSION Filed- Oct. 20, 1928 2 Sheets-Sheet 2 i o I L Q &

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Patented Nov. 4, 1930 '7 R PATENT ESAMUEL 3. eon-n Ann seems. eoLnfoF Kn vsAs cm, Mrs sonar, Assienons To WE nne nnooivirnnv, on ignns iscrryv nssonnnn oo'nronn'rionon IOWA iwmme wnmrsmseos I Our inventionrrelates toipowerftrans'niitting mechanism and more particularly to apparatus of that character for transmitting the power of a prime mover to variable working loads '5 the principleohje'ctsiof theinvenigsmf'ineet varying; powerfrequirements of the tails of structure;-"the*preferred' forms of :1. which are illustrated in the; a co panyin drawings, wherein: 3

- FigJl is a perspectivelview of aipower.

transmitting m nism constructed in a COId LIlCGwllillOilr'lnvent n .20' Fi .5 2' is] a centra horizontal I section through the *transn ittin g mechanism;

l Referring more in detail drawings l desig'nates a'prinie'inovers'uch as an ordi- 32. nary'iiiternal coinbustioii enginehavinga power shaft 2 equipped with a flywheel 3,

thelhub 4 of the fly wheel beingjadapted 'for connection withour improved po mittingmechanism now describ'ed,

30 gR'otatahly mounted in endfalignrnentwith "the power shaft and connected to thejfiy wheelhub bya flexible coupling 5 is a shaft I 6 having its'freeouterend rotatably mounted in ahearing 7, supported upona pedestalS powershaft of the engine. l f

'Rot'atably mounted on the shaft 6 and in spaced relation with the coupling 5 is a re- I versiblefpulley 9 for delivering power'of the priine'inover totheworkingload through various-working speeds which, in the present illustration, comprise high and low speed forwardand-za single speed in. reverse. 7 The pulley9 is provided with an extended hub 10 having an internal bore of larger diaineter than the/shaft to receive a pluralityof roller and i lateral flange portion: 16 vextending from the offset portion to provide;-ai brake .drum 17 and working: on the ,dr'um1 17,. is a f brake band 18 whereby rotationof thepulley .niay' be controlled or completelystopped as the bell crank having adependingarm 22and a forwardly extending arm' 23, which arms The bell crank lev'er. shaft. may i be; rocked hy a reciproc'atory actuating rod 25 fixed Ito er trans-- ,whichis bolted to an extension ofthe engine foundation or other-suitablesupport to n aintain'the shaft 6 in true aligninent'with the l I portedfrom the hub by spokes 34, the spokes hearingsets 11. Thehnbis connected with the riiii lZof thepulle v hy spokes and an end'web14p 1K, '1 .Theend web .l lhasfanofiset portion 15 when" shifting from onespeed to' another 0r whenchanging directions of rotation.

. The ban'd 18 may be'contracted about the .druin by any suitahle brake actuating mech- I shaft 20 .pivotallymounted in a bracket 21, J

are connected Iwith respective ends 1 of the v brake h'andby rods 24 and24 respectively.

the end of a lever. 26' provided on "the shaft 20 so that by shifting the rod forwardly-the bell crank mayberocked-to tighten the band aboutithe drum, and stop rotation of. the

' .Hz'gip specdfor'dvord of the pulley projects beyondthe outer side face'of the pulley on'the side op- "posite the brake drum, and is provided-With a web #27 having. a, laterally extending peripheral -flange28 constituting a clutch dr'umf29 p o Fixed tothe shaft adj 'ace'nt the clutch drum is acliitchfshoe supporting disk 30;coniprising a hub 31splinedto the shaft by a key; 3 2 and carrying an integrally cast rim 3'3i supfromtheperipheralface oftherim 8'3; 39 5 9 designates clutch "shoes having laterally, fleX- tending arms 40 threadedinto theprojec'ting ends 41 0f the rods 38 foradjustably-mount- Jin'gtheshoes' on therods." v

Theshoes-39 are arranged about the clutch 1 drum and are provided with brake blocks 74 comprising cup shaped metal stampin ofthe actuating levers 36. 'The sleeve 46 is also provided with a peripheral groove 49 for receiving a ring 50having laterally eX- tending pins 51 for engaging a yoke 52 of a shifting lever 53. The lever 53-ismounted on a rock shaft 54 rotatable in bearings 55 fiXed'to the transmission foundation and eX- tending at right angles to the power shaft.

catory rod 56 extending parallel with the brake actuating rod and is connected with an arm 57 of a horizontally mounted bell crank lever 58, the other arm 59 of the bell -:crank being connected with an arm 60 on the rock shaft by a draglink 61.

Thus when the'rod 56 is shifted forwardly,

the bell crank-is pivoted to rock theshaft 54, causing the arm153 to shift the sleeve toward the clutch drum, the'shifting of the sleeve causing the links 48 to rock the shoe actuating levers to draw the rods -inwardly and-bringing the clutch shoes into contact with the clutchdrum. Since' the shoes "are carried by the disk-30 which is keyedon the shaft 6 the clutch'drum will rotate therewith and drive the pulleyat the speed of the shaftor at high speed ina forward direction. p a 'J H igh reverse speed Fixed to a projecting hub 62 extending from the outer face 7 of the pulley web 14 by bolts 63 is abevel gear 64 and spaced from the gear 64 isacomplementary gear 65which,

' together with the gear 64, constitutes respectively the driver and the driven gear of the reversing mechanism now described. 8 I

Rotatably mounted'between the gears 64 and 65 on roller bearings 66 is a planetary gear carrier 67 comprising a hub v 68, bored to receive the bearings, and a rim 69 cast integrally therewith Fixed in sockets 70 formed inthe hub and in aligning openings 71 in the are pinion supportingshafts 72 carrying'bevel pinions 73 for meshing with the gears 64 and 65 to drive the pulley as later described. l

The gearing may be enclosed in a housing 7 5 having peripheral flanges 76 for ment: to the planetary gear carrier by bolts 77, the bolts extending through the rim 69 and the flanges 76. The flanges 76 preferably project from the face of the rim to progiving the sion. The rock shaft may be actuated by a recipro- 1 Locatedto the rear ofthe shaft and in par allel relation therewith is a counter shaft 84 gwhichjis rotatably mounted in spaced bearings 85 and'86 supported on brackets 87 and 88 that are bolted to the foundation. The

ends 89, and 90 of the shaft project through the bearings 85 and, 86 and fixed'on the respective ends of the shaft, by keys 91 and 92, are sprockets 93 and 94 of different diameter.

over the sprockets.

ends with a bell crank lever 80 which is operated to contract the band by a rod 81 connected with an arm 82 on a shaft 83 that is mounted in the bracket 21 in end alignment with the shaft 20 and actuated in the same manner as the bell crank for the pulley brake band. Thus when the brake band is tightened about the carrier rim, rotation of the gear carrier is stopped,stopping planetation of the pinions 73, whichcauses the gear 65 to rotate the planet gears on their shafts 72 to drive gear 64 in reverse direction to the gear 65 and to the shaft, and since the gear 64 isfixed to-the pulley the pulley is driven.

reversely and at the same speedas the shaft,

reverse speed for the transmis- Low speed Rotatably mounted on theouter end of the shaft 6 is aiclutch drum 95similar in construction to the clutch drum 29 heretofore described, and bolted to the drumis a sprocket wheel 96 positioned in' alignment with the larger sprocket 93 on thecounter shaft. The clutch drum 95 is adapted to be driven from the shaft by a clutch shoe mech anism-97'identical with that; of the clutchdrum 29 and actuated by the sleeve 46 (here- 7 tofore. described), the actuating levers of the clutch being connected with the end of the sleeve opposite the clutch drum 29 by links complementary'to the links 47 so thatwhen the sleeve is shifted outwardly on the shaft, the clutch shoe mechanism 97 engages the 'drum and drives the drum therewith at the speed of the shaft, and causes the sprocket 96on the drum todrive the gear 93 on the counter shaft through a chain 98 running Bolted to the web of the clutch drum 29 and resting on an offset shoulder 99 in the web is a sprocket 100 located in alignment with the smaller sprocket 94 on the counter shaft and driven therefrom by a' chain 101 running over the sprockets to drive the pulley, the sprockets being of such size as to drive the pulley at a speed less than the speed of the shaft, giving the low speed for the transmission.

Attention is called to'the fact that while the pulley is being driven at low speed the bevel pinions 73 act as differentials to comvlde a peripheral seat 78 for a brake band 79 extendingabout the rim and connected at its pensate for the difference of speed between shaft and the speed of the gear 64 which is 'fixed tojthe pulley.

- In operating a transmission constructed as described, the engine may be run at its rated speed and a pulley speed suitable to the requirements of the load can be obtained gaging the loose member to drive the coun ter shaft In tes tures.

by'shifting the rod 56 rearwardly toengage the clutch drum for driving the pulley at low speed through the counter shaftor the rod may be moved forwardly to cause engagement of the clutch drum 30 for-driving the pulley at high speed. Or the rod maybe shifted to move the sleeve to neutral position so that neither drum is engaged and then the 'rod'80 maybe shifted forwardly -to tighten the brake band. on the planetary gear carrier,"causing the pulley to be driven reversely and at the same speed as'the shaft.

Thus it is apparent that we have provided a reverse clutch pulley with high and low speeds forward sothat the various speeds may be selected in an efficient and expeditious manner to suit the conditions of the working t load, and at thesame time running the engine within its normal speed range.

,What we claim and desire to secure by 1' Letters Patent is:

t 1. In a device of they class described, a l power shaft, a pulley loosely mounted on the power shaft, clutch mechanism connecting the power shaft with'the'pulley to' drive the pulley at thespeed" of the power-shaft,

the counter shaft and driven-from the sprocket wheel on the powert'shaft, .asecond sprocket wheel fixed. on the, counter shaft,

a sprocket wheel fixed on the pulley driven 7 from the last named sprocket Wheel, and r a clutch for connecting the r first named sprocket wheel to the power shaft."

2.111 a device of the character described,

apower' shaft, a reverse clutch pulley on;

the shaft, a counter shaft, aligning sprockets on the respective shafts, one of the sprockets beingloose on its shaft, a chain belt running over the sprockets, a sprocket on the clutch pulley, a sprocket on the counter t shaft aligning with the sprocket on the clutch pulley, a chain'running over-the last named sprockets to drive the reverse clutch pulley from the counter shaft, and, a clutch for engaging the loose sprocket to drive, the

counter shaft.

8. In a devicefof'thecharacter described,

a power shaft, a reverse clutch pulley on the shaft, a counter shaft, a drive member zits shaft, 'a driven member on'the reverse a p ket Wheel loose on thetpower shaft, o ter Shaft, a sprocket wheel fixed on clutch pulley, an aligning drive memberon the counter shaft for driving the driven t 7 member on the pulley, and a clutch for entimony whereof we affix our signa- SAMUEL B. GOLD. BRUCE neon). r

I so 

